CAJ | 학술논문

目的通过研究牙列拥挤患者拔除双侧第1前磨牙6个月后,上颌牙列生理性漂移的移动量及移动类型,为扩展漂移矫治的适应证提供依据.方法选择20例牙列拥挤需拔除双侧第1前磨牙的安氏Ⅰ类病例,男8例,女12例,年龄11～14岁.拔牙后最初6个月上、下颌牙齿都不戴矫治器.收集漂移前和漂移后6个月的研究模型、头颅侧位片和曲面断层片资料.测量上颌漂移前后的拔牙间隙、前牙拥挤度和前牙不齐指数;尖牙和第1恒磨牙牙冠和根尖的移动量;各个牙轴的倾斜度的变化.用配对t检验比较漂移前后的变化.用Pearson相关分析尖牙远移量与漂移前上牙弓状况的相关性.结果 (1)模型测量显示漂移后上颌拔牙间隙双侧共减少(5.79±4.9)mm(P＜0.01);前牙拥挤度减少(5.79±4.12)mm,前牙不齐指数减少(3.17±4.61)mm(P＜0.01).(2)头颅侧位片测量尖牙牙冠平均远中移动(4.87±3.54)mm(P＜0.01),牙轴由近中倾斜变为直立.(3)上颌第1恒磨牙牙冠平均近中移动(1.18±0.52)mm(P＜0.01),根尖位置无变化.尖牙牙冠后移量与漂移前前牙拥挤度和尖牙近中倾斜度呈正相关(P＜0.01).结论拔除双侧第1前磨牙6个月后,尖牙远中直立移动使上前牙拥挤缓解;支抗磨牙移动不明显.
목적 통과연구아렬옹제환자발제쌍측제1전마아6개월후,상합아렬생이성표이적이동량급이동류형,위확전표이교치적괄응증제공의거.방법 선택20례아렬옹제수발제쌍측제1전마아적안씨Ⅰ류병례,남8례,녀12례,년령11～14세.발아후최초6개월상、하합아치도불대교치기.수집표이전화표이후6개월적연구모형、두로측위편화곡면단층편자료.측량상합표이전후적발아간극、전아옹제도화전아불제지수;첨아화제1항마아아관화근첨적이동량;각개아축적경사도적변화.용배대t검험비교표이전후적변화.용Pearson상관분석첨아원이량여표이전상아궁상황적상관성.결과 (1)모형측량현시표이후상합발아간극쌍측공감소(5.79±4.9)mm(P＜0.01);전아옹제도감소(5.79±4.12)mm,전아불제지수감소(3.17±4.61)mm(P＜0.01).(2)두로측위편측량첨아아관평균원중이동(4.87±3.54)mm(P＜0.01),아축유근중경사변위직립.(3)상합제1항마아아관평균근중이동(1.18±0.52)mm(P＜0.01),근첨위치무변화.첨아아관후이량여표이전전아옹제도화첨아근중경사도정정상관(P＜0.01).결론 발제쌍측제1전마아6개월후,첨아원중직립이동사상전아옹제완해;지항마아이동불명현.
Objective To study the distance and pattern of the movement of the maxillary teeth after 6 months driftodontics for dental crowding.Methods 20 dental crowding children,according to the treatment plan,who were required to removal four first premolars,were involved in this study (8 males,12 females,aged 11-14 years old).All of the children did not wear appliance in six months after teeth extraction.X-ray image data before and six months after teeth extraction were collected.The width of extraction space,the anterior irregular index and inclination of the axis of each tooth were recorded before and six months after tooth extraction.The data were analyzed by t-test and Pearson relative analysis.Results The study model showed that bilateral maxillary space of extraction pre-and pro-driftodontics decreased (5.79 ± 4.9) mm (P ＜ 0.01) ; anterior crowding decreased (5.79± 4.12) mm,irregular index was significantly reduced (P＜0.01).Cephalometric film measurement showed that canine crown moved distally (4.87±3.54) mm after the drift (P＜0.01).Canine tooth axis changed from mesial to upright.The crown of maxillary first molar moved mesially (1.18± 0.52) mm (P ＜ 0.01).There were no significant changes in apical position.Conclusions After 6 months of the physiological drift,upright moving of canine relieves anterior teeth crowding.The molar anchorage is saved.